YY WW X00 Three Channel Optical Incremental Encoder Modules Technical Data HEDS-9040 HEDS-9140 Features Description Two Channel Quadrature The HEDS-9040 and HEDS-9140 Output with Index Pulse series are three channel optical incremental encoder modules. Resolution Up to 2000 CPR When used with a codewheel, Counts Per Revolution these low cost modules detect Low Cost rotary position. Each module Easy to Mount consists of a lensed LED source No Signal Adjustment and a detector IC enclosed in a Required small plastic package. Due to a Small Size highly collimated light source and -40C to 100C Operating a unique photodetector array, Temperature these modules provide the same high performance found in the TTL Compatible HEDS-9000/9100 two channel Single 5 V Supply encoder family. Package Dimensions 26.67 (1.05) 8.6 (0.34) 15.2 (0.60) 0.63 (0.025) 2.54 (0.100) TYP. SQR. TYP. 1.8 1.52 (0.060) OPTION CODE (0.07) 1.0 (0.04) 5.1 (0.20) 2.9 DATE CODE 2.21 6.9 (0.27) (0.11) 11.9 (0.087) 2.54 3.73 0.05 (0.47) 20.8 (0.100) (0.147 0.002) (0.82) 1.02 0.10 11.7 (0.040 0.004) 8.81 (0.46) 5.8 (0.347) 45 4.75 0.01 (0.23) OPTICAL 2.67 (0.105) DIA. ALIGNING RECESS (0.187 0.004) CENTER LINE MOUNTING THRU 2.44/2.41 DIA. C HOLE 2 PLACES 1.85 (0.073) L 1.78 0.10 5.46 0.10 (0.096/0.095) 2.16 (0.085) (0.070 0.004) (0.215 0.004) 8.64 (0.340) 2.44/2.41 X 2.79 DEEP REF. (0.096/0.095 X 0.110) 2.92 0.10 OPTICAL 17.27 4.11 (0.162) 2.16 (0.085) DEEP (0.115 0.004) CENTER (0.680) 10.16 20.96 OPTICAL CENTER (0.400) (0.825) 6.35 (0.250) REF. TYPICAL DIMENSIONS IN SIDE A MILLIMETERS AND (INCHES) SIDE B ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE. V CC 5 CH. B 4 V CC 3 CH. A 2 CH. 1 1 GND GND HEDS-90402 Block Diagram The HEDS-9040 and 9140 have two channel quadrature outputs plus a third channel index output. This index output is a 90 electrical degree high true index pulse which is generated once for each full rotation of the codewheel. The HEDS-9040 is designed for use with a HEDX-614X codewheel which has an optical radius of 23.36 mm (0.920 inch). The HEDS-9140 is designed for use with a HEDS-5140 codewheel which has an optical radius of 11.00 mm (0.433 inch). The quadrature signals and the index pulse are accessed through Emitting Diode (LED) as its light channels A and B. Due to this five 0.025 inch square pins source. The light is collimated integrated phasing technique, the located on 0.1 inch centers. into a parallel beam by means of a digital output of channel A is in single polycarbonate lens located quadrature with that of channel B Standard resolutions between 256 directly over the LED. Opposite (90 degrees out of phase). and 2000 counts per revolution the emitter is the integrated are available. Consult local detector circuit. This IC consists The output of the comparator for Agilent sales representatives for of multiple sets of photodetectors I and I is sent to the index other resolutions. and the signal processing processing circuitry along with circuitry necessary to produce the the outputs of channels A and B. digital waveforms. The final output of channel I is an Applications index pulse P which is generated O The HEDS-9040 and 9140 The codewheel rotates between once for each full rotation of the provide sophisticated motion the emitter and detector, causing codewheel. This output P is a O control detection at a low cost, the light beam to be interrupted one state width (nominally 90 making them ideal for high by the pattern of spaces and bars electrical degrees), high true volume applications. Typical on the codewheel. The photo- index pulse which is coincident applications include printers, diodes which detect these with the low states of channels A plotters, tape drives, and interruptions are arranged in a and B. industrial and factory automation pattern that corresponds to the equipment. radius and design of the code- wheel. These detectors are also Theory of Operation spaced such that a light period on The HEDS-9040 and 9140 are one pair of detectors corresponds emitter/detector modules. to a dark period on the adjacent Coupled with a codewheel, these pair of detectors. The photodiode modules translate the rotary outputs are then fed through the motion of a shaft into a three- signal processing circuitry channel digital output. resulting in A, A, B, B, I and I. Comparators receive these signals As seen in the block diagram, the and produce the final outputs for modules contain a single Light